<script setup lang="ts">
import { computed, ref, watch } from 'vue';
import { jsx } from 'vue/jsx-runtime';

// 定义水果对象的类型
interface Fruit {
  id: number
  icon: string
  isChecked: boolean
  num: number
  price: number
}

// 水果列表
// 为进行持久化存储，需要建立一个临时数据
const temArr = ref<Fruit[]>([
  {
    id: 1,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png',
    isChecked: true,
    num: 2,
    price: 6,
  },
  {
    id: 2,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png',
    isChecked: false,
    num: 7,
    price: 20,
  },
  {
    id: 3,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png',
    isChecked: false,
    num: 3,
    price: 40,
  },
  {
    id: 4,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png',
    isChecked: false,
    num: 10,
    price: 3,
  },
  {
    id: 5,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png',
    isChecked: false,
    num: 20,
    price: 34,
  },
],) 
let fruitList = temArr // 临时数据
// 判断本地是否有数据，有数据就用本地的数据
// console.log(localStorage.getItem('FruitCar'));
if (localStorage.getItem('FruitCar') !== null && localStorage.getItem('FruitCar')!=='[]') {
  fruitList = ref(JSON.parse(localStorage.getItem('FruitCar')as string)as Fruit[])
}


//1.删除
const del = (id:number) => {
  fruitList.value = fruitList.value.filter(item=>item.id !== id)
}

//2.减少商品数量
const sub = (id:number) => {
  // 根据id找对象
  const fruit = fruitList.value.find(item => item.id === id)
  // 数量--
  fruit && fruit.num--
}

// 3.增加商品数量
const add = (id:number) => {
  // 根据id找对象
  const fruit = fruitList.value.find(item => item.id === id)
  // 数量--
  fruit && fruit.num++
}

// 4.全选和取消全选----computed计算属性，绝大多数只拿到，但也有修改的值6
const checkAll = computed({
  // 一进入获取是否选中---一定要返回值
  get() { 
    return fruitList.value.every(item =>item.isChecked)
  },
  //修改
  set(value) {
    console.log('来了', value)
    //遍历原数组---进行修改
    fruitList.value.forEach(item=>item.isChecked = value)
  }
})

// 5.总价和总数量
// 总数量
const totalCount = computed(() => {
  return fruitList.value.reduce((sum,item) => {
    if (item.isChecked) {
      return sum + item.num
    } else {
      return sum
    }
  },0)
})
//总价格
const totalPrice = computed(() => {
  return fruitList.value.reduce((sum,item) => {
    if (item.isChecked) {
      return sum + item.num * item.price
    } else {
      return sum
    }
  },0)
})

// 6.持久化到本地
watch(() => fruitList, (newValue) => {
  //键值必须是字符串
  localStorage.setItem('FruitCar',JSON.stringify(newValue.value))
 }, {
  //深度侦听
  deep:true
})
</script>

<template>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length > 0">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div v-for="item in fruitList" :key="item.id" 
          class="tr" :class="{active:item.isChecked}">
          <!-- v-model 进行双向绑定 -->
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <!-- :disabled 加上以后，数量就不会再减下去 -->
                <button :disabled="item.num <=1 " class="decrease" @click="sub(item.id)"> - </button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button class="increase" @click="add(item.id)"> + </button>
              </div>
            </div>
            <div class="td">{{ item.num * item.price }}</div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>

       
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input v-model="checkAll" type="checkbox" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{totalPrice}}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ totalCount }})</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
  </div>
</template>

<style scoped>
@import './style/inputnumber.css';
@import './style/index.css';
</style>